A group of people at the election rally at Warsaliganj showed 'chappals' while Kumar was addressing the rally in favour of JD(U) candidate Pradeep Kumar who is the sitting MLA.
The restive crowd shouted "Modi, Modi" chant and also chanted anti-Nitish slogans at the rally, ahead of the five-phase state Assembly elections beginning on Octiber 12.
Unperturbed by the protest, Kumar went ahead with his address and listed achievements of his government and his future vision particularly for youths.
Though the exact reason behind the incident was not known, the scene continued while Kumar was delivering his speech.
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"You mean to say that people chose a person with defective DNA as their Chief Minister for the past 10 years," he said.
The senior JD(U) leader also questioned the BJP slogan of "parivartan" (change).
"By parivartan do you mean to send back girls home from school where they are going today on bicycles?" he said slamming the BJP.
The chief minister reiterated his seven future resolves, contained in his vision document, worth Rs 2.70 lakh crore which included Rs 4 lakh credit facility for students.
The PM had earlier mocked at Kumar for protesting his comment regarding Bihar remaining in the category of BIMARU states by saying if the state was no more in that category why does Kumar come to Delhi with bowl to seek more fund.